Enzymes
What is an enzyme?
• Organic catalyst
• Protein molecule
What is the function of an
enzyme?
Speed up chemical reactions by lowering the activation
energy
Activation Energy
• energy required to start all chemical reaction
• How can all reactions require energy, if some
are considered exergonic/exothermic?
Induced-Fit Model
Factors that affect enzyme functioning
1.
2.
3.
4.
5.
6.
Temperature
pH
Enzyme concentration
Substrate concentration
Cofactors/coenzymes
inhibitors
Cofactors/Coenzymes
Feedback Inhibition
• End product controls action of enzyme
• When end product binds to enzyme, there is a
change of shape and enzyme no longer
functions